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Sulfur dots–graphene nanohybrid: a metal-free electrocatalyst for efficient N₂-to-NH₃ fixation under ambient conditions
- ChenThese authors contributed equally to this work., Hongyu, Zhu, Xiaojuan, Huang, Hong, Wang, Huanbo, Wang, Ting, Zhao, Runbo, Zheng, Hongguo, Asiri, Abdullah M., Luo, Yonglan, Sun, Xuping
- Chemical communications 2019 v.55 no.21 pp. 3152-3155
- ammonia, carbon dioxide, catalysts, chemical reactions, electrochemistry, electrodes, greenhouse gas emissions, hydrogen, nanohybrids, nitrogen, sulfur
- NH₃ is an important chemical with a wide range of applications, but its synthesis mainly relies upon the harsh Haber–Bosch process with huge CO₂ emission. Electrochemical N₂ reduction offers a carbon-neutral process to convert N₂ to NH₃ under ambient conditions, but it requires efficient and stable catalysts to drive the N₂ reduction reaction. Herein, we report that a sulfur dots–graphene nanohybrid acts as a metal-free electrocatalyst for ambient N₂-to-NH₃ conversion with excellent selectivity. When operated in 0.5 M LiClO₄, this electrocatalyst achieves a large NH₃ yield of 28.56 μg h⁻¹ mgcₐₜ.⁻¹ and a high Faradaic efficiency of 7.07% at −0.85 V vs. reversible hydrogen electrode. Notably, it also shows good electrochemical stability.